This google book mentions a Donald Cameron BORN 1814 to the Judge and his SECOND wife Persis:(This book also confirms what the stark website said: that John's son Donald (b.1814) belonged to his 2nd wife, they were married in Feb 1814 and Don was born in September 1814)
"By 2nd marriage:
Donald b. 30 Sep 1814, teacher, went to CA, no record"http://books.google.com/books?id=pmwjAQAAMAAJ&lpg=PA306&...
Here its mentioned he was a teacher, i believe this may be our school teacher Donald of Illinois! I'm not sure about the CA reference, i suppose it is possible because the Camerons in my family did eventually end up in California- but this wasn't until his grandsons guy e. Cameron's time. Donald (b. 1814)'s son Donald R. Cameron was buried in CA too in 1929.